Phylum Mollusca Protostomes Lophotrochozoan group Eucoelomates (coelomates)
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1 Phylum Mollusca
2 Phylum Mollusca Protostomes Lophotrochozoan group Eucoelomates (coelomates) Tridacna gigas Tridacna squamosa
3 Phylum Mollusca Soft Bodied Shelled Some without Cephalization Sensory organs Mouths Body Divisions Visceral Mass Head-Foot Mantle Tonicella lineata
4 Phylum Mollusca Complete digestive tract Octopus briareus Digestive glands Specialized feeding structures Circulatory system Heart (2 chambers) Open system in most groups Closed in cephalopods Coelom restricted to pericardium in most cases
5 Phylum Mollusca Advanced nervous system Brain Sensory organs Eyes (simple and camera) Sensory papillae Excretory system Kidney-like nephridia Reproduction Monoecious and dioecious External development External & internal fertilization
6 Mollusc Phylogeny ~50-80K extant species ~40K extinct species Fossil records from precambrian period of proterozoic eon (>570my BP)
7 Mollusc Phylogeny Mantle secreting shell Muscular foot Chambered heart
8 Mollusc Taxonomy Major classes Polyplacophora Chitons Chiton tuberculatus lives in the rocky intertidal zones eat algae with its radula 8 shell plates
9 Mollusc Taxonomy Atlantic triton s trumpet (Charonia variegata) Major classes Polyplacophora Gastropoda Subclasses: Prosobranchia Shelled marine gastropods Tiger cowrie (Cypraea tigris)
10 Mollusc Taxonomy Spotted sea hare (Aplysia dactylomela Major classes Polyplacophora Gastropoda Subclasses: Prosobranchia Opisthobranchia Sea slugs (marine) Phidiana hiltoni zebra sea goddess (Hypselodoris zebra)
11 Mollusc Taxonomy Helminthoglypta walkeriana Major classes Polyplacophora Gastropoda Subclasses: Prosobranchia Opisthobranchia Pulmonata Terrestrial snails/slugs Freshwater snails Giant banana slug (Ariolimax columbians)
12 Mollusc Taxonomy Major classes Polyplacophora Gastropoda Bivalvia Clams, oysters, mussels, scallops Ostrea edulis Bay scallop (Aequipecten irradians) Edible mussels (Mytilus edulis)
13 Mollusc Taxonomy Giant cuttlefish (Sepia latimanus) Major classes Polyplacophora Gastropoda Bivalvia Cephalopoda Octopus sp Octopus, squid, nautilus Nautilus sp
14 Mollusc Taxonomy Major classes Polyplacophora Gastropoda Bivalvia Cephalopoda Minor classes Monoplacophora Solenogastres Caudofoveata
15 Generalized Mollusc Anatomy
16 Gastropod Feeding Apparatus
17 Respiration: Gills
18 Shell Structure & Formation
19 A Pearl Among the Swine
20 Mollusc Reproduction & Development Indirect development Larval stages Trochophore larva Free swimming, ciliated, shell formation begins Veliger larva Free swimming, ciliated velium forms, Shell/body torsion occurs Spat Metamorphic form between veliger and juvenile Shell elaborates
21 Trochophore Larva
22 Gastropod Veliger Larva Mouth Velia Shell
23
24 Veliger Zygote Trochophore Juvenile Adult Spat
25 Adult Abalone
26 Class Polyplacophora - chitons
27 Polyplacophoran Anatomy
28 Class Gastropoda The Shell Game
29 Class Gastropoda - Torsion
30 Gastropod Shell Coiling
31 Gastropod Gill/Mantle Cavity Evolution
32 Generalized Gastropod Anatomy
33 Marine Gastropods Cowries
34 Marine Gastropods Sea Hare Aplysia sp
35 Marine Gastropods - Nudibranch
36 Terrestrial Gastropods - Pulmonata The mantle cavity serves as a lung Glandular epidermis Secrete mucus (slime) upon which gastropod glides
37 Terrestrial Gastropod - Pulmonata Pneumostome Slugs lack shells Mantle thickened Pneumostome Air intake into mantle cavity
38 Phylum Mollusca, Class Bilvalia Two shells Incurrent & excurrent siphons No cephalization
39 Generalized Bivalve Anatomy
40 Generalized Bivalve Anatomy (XS)
41 Bivalve Anatomy (Sagittal)
42 Bivalves are Typically Filter Feeders
43 Bivalve Life Cycle
44 Glochidia Unique Larval Stage of Freshwater Bivalves Internal fertilization Early development in brood chamber (region of mantle cavity) Release of glochidia veliger larvae Glochidia attach to gills of fish and are distributed
45 Phylum Mollusca, Class Cephalopoda Closed circulatory system Shell: lost in Octopus, extremely reduced and enclosed in mantle in squid, planar spiral in Nautilus Cephalization eye Beak around mouth Tentacles/arms
46 Cephalopod Anatomy
47 Squid are the largest Cephalopods
48 Nautilus Anatomy
49 Cephalopod Eye
50 Mating
51 Direct Development in Cephalopods
52 Color & Morphology Changes for Camouflage
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